What I’ve Learned About Indoor Air Quality – and Why It Matters More Than You Think (Part 3)

I began this project wanting to understand indoor air quality based on facts, not assumptions. What I discovered went far beyond what I expected. Although my research focused on wood‑burning stoves in the home, many of the findings apply to indoor air quality more broadly.

Can Air Purifiers Really Help in Wood‑Burning Homes?
If you burn wood at home, you’ve probably wondered whether anything can genuinely improve indoor air quality. In Part 2, we explored practical steps around fuel choice, stove use, and ventilation.  If you have not seen this post please check it ou.  Here, I want to look at one more tool: air purifiers.

And before we go further, let me say this clearly: yes, I’m part of You Want Pure Air, but this is not a sales pitch. My aim is simply to explain where air purifiers fit into a wider indoor air strategy. In this case, my research focused specifically on homes that use wood as their primary heat source.

Just as Ecodesign stoves can be highly effective when the full process is followed, I now want to explore if air purifiers can also be efficient when used correctly.

What the Research Shows
In Canadian homes exposed to both indoor wood‑stove smoke and outdoor ambient smoke, an air purifier reduced indoor particulate matter by an average of around 52% on days it was running. Not perfection — but a meaningful improvement.

What Affects Purifier Performance?
•    Filter quality: True HEPA or high‑efficiency filters outperform low‑grade filters.
•    CADR & air turnover: Higher clean‑air delivery and more air changes per hour lead to better results.
•    Room sealing: Drafts and leaks allow smoke to enter and reduce purifier efficiency.
•    Usage behaviour: Running the purifier during and after burning, placing it near the source, and keeping windows closed when smoke is present all make a difference.
But There Are Limitations even with a strong purifier:
•    Coarse particles (PM₁₀), VOCs, and gases may remain.
•    Refuelling spikes can overwhelm a room before the purifier catches up.
•    Some homes may still exceed recommended PM levels, even after filtration.
So… Can Air Purifiers Help?

Undoubtedly YES — they can make a substantial difference, especially when combined with good stove habits and proper ventilation. They’re not a magic wand, but they are a valuable part of a broader indoor air management approach.

If you burn wood and want to reduce exposure for yourself or your family, an air purifier is worth considering — not as a replacement for good practice, but as a supportive tool that can meaningfully reduce particulate levels.